Definition of molecule in English:

Share this entry

molecule

Pronunciation: /ˈmɒlɪkjuːl/

noun

Chemistry
A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
Example sentences
  • It works by affecting a molecule called nitric oxide, which expands blood vessels.
  • In the water molecule there are three atoms: two of hydrogen and one of oxygen.
  • The reactant ions have enough energy to ionise the molecules of interest but not enough to break them up.

Origin

Late 18th century: from French molécule, from modern Latin molecula, diminutive of Latin moles 'mass'.

Share this entry
 

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.